They are starting by making a stronger foundation for next season, so that they are not left far behind, because if we compare with Napoli it is clear that the difference is visible. But this season will be more different for Napoli, because they also lost their coach who chose to leave, so a form of change that will definitely make a difference to their performance next season.
Juventus lost their way in the last few seasons, and slowly they are finding their form again, next season we will see if they will be able to do even better or just the opposite, because sometimes the problems do not come from within them, but also come from outside.
Juventus finished seventh in the Serie A standings last season as a result of being sanctioned with a 10 point deduction penalty for being proven to have inflated transfer fees. If they don't get penalized, I think they will finish in the top four and enter the Champions League zone. An advantage is also they are not sentenced to relegation to Serie B as happened in 2006 ago.
I agree with you Juventus are making fundamental changes with the change of new director Cristiano Giuntoli. This is the foundation for rebuilding the Juventus squad for next season, if you want to repeat their dominance in Serie A then that is a good step. Next season will certainly be more competitive and difficult to fight for the Scudetto. If I try to analyze the order of favorites for the Serie A champions next season, I will place Inter Milan in first place, Napoli in second and As Roma in third place. I think Jventus needs time to build and improve the squad, only then can they become favorites for next season.